scholarly journals Method and Criteria to Evaluate Reheat Cracking Susceptibility

2020 ◽  
Vol 99 (6) ◽  
pp. 175s-183s
Author(s):  
LI ZHANG ◽  
◽  
KAI WANG ◽  
YU HUANG ◽  
CHI XU ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Restraint Stress ◽  
Sampling Method ◽  
Thick Plate ◽  
Evaluation Criteria ◽  
Test Method ◽  
Coarse Grain ◽  
Treatment Procedure ◽  
Evaluation Standard ◽  
Reheat Cracking

Due to a lack of facile methods for evaluating the reheat cracking susceptibility of the coarse grain heat-affected zone (CGHAZ), a simple notched C-ring reheat cracking test method and evaluation criteria were proposed. Accordingly, a suitable C-ring sampling method and heat treatment procedure were established. The C-ring specimens were taken from thick plate joints welded under five different heat inputs and testing was carried out. Reheat cracks were observed and identified under different stress loadings. Subsequently, related with the evaluation criteria of the Gleeble® test, the evaluation criteria based on notched C-ring tests were developed. This method can reflect both the microstructure and restraint stress of actual welded joints, and the stress relaxation during heat treatment. Moreover, the experimental operation is simple and repeat-able. It is expected that an evaluation standard for reheat cracking sensitivity in CGHAZ will be established.

Magnetocaloric and other Properties of Cold Rolled Gd Ribbons

2013 ◽  
Vol 738-739 ◽  
pp. 441-445
Author(s):  
Sergey Taskaev ◽  
Vasiliy D. Buchelnikov ◽  
Anatoliy Pellenen ◽  
Dmitriy Bataev ◽  
Konstantin Skokov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Heat Capacity ◽  
Magnetocaloric Effect ◽  
Treatment Procedure ◽  
Magnetic Cooling ◽  
Cooling Devices ◽  
Cold Rolled ◽  
Heat Treatment Procedure

In this work we investigate magnetocaloric effect and heat capacity of Gd cold rolled ribbons. Such materials are easy to produce, they are flexible and convenient for using in magnetic cooling devices. It is shown that the magnetocaloric effect is strongly dependent on thickness of the ribbons. Severely rolled ribbons demonstrate rather a small magnetocaloric effect. However, a special heat treatment procedure makes it possible to enhance the effect up to the value observed in polycrystalline Gd.

Research on the V/H Inspection of Spiral Bevel Gear before Heat Treatment

2013 ◽  
Vol 483 ◽  
pp. 166-169
Author(s):  
Jia Lun Qiu ◽  
Rui Rong Zhao ◽  
Ying Jie Wang ◽  
Wei Zhao ◽  
Jing Cai Li
Keyword(s):  
Heat Treatment ◽  
Contact Region ◽  
Bevel Gear ◽  
Test Method ◽  
Spiral Bevel Gear ◽  
Basic Definition ◽  
Technical Process ◽  
Inspection Method ◽  
Spiral Bevel

The V / H inspection method is analyzed, including its basic definition, purpose and V / H inspection technical process of Gleason Company. In order to improve the quality of the contact region, Gleasons V / H test method is conducted for V/H inspection of spiral bevel gear before heat treatment, and analysis of experimental data is given.

scholarly journals Faktor-faktor yang Mempengaruhi Kinerja Keuangan Perusahaan BUMN yang Terdaftar di Bursa Efek Indonesia Periode 2015-2019

2021 ◽  
Vol 5 (1) ◽  
pp. 99
Author(s):  
Riris Kharisma ◽  
Kartika Hendra Titisari ◽  
Suhendro Suhendro
Keyword(s):  
Corporate Governance ◽  
Corporate Social Responsibility ◽  
Social Responsibility ◽  
Financial Performance ◽  
Sampling Method ◽  
Secondary Data ◽  
Test Method ◽  
Company Size ◽  
Good Corporate Governance ◽  
Corporate Social

This study aims to determine the effect of good corporate governance, corporate social responsibility, leverage and company size on the financial performance of state-owned companies listed on the IDX. The data in this study use secondary data. The population in the study of all BUMN companies listed on the IDX for the 2015-2019 period. The sample used in this study was 9 samples of BUMN companies listed on the IDX for the 2015-2019 period, with the sampling method using purposive sampling method. The test method in this study uses multiple linear regression test. The results show that good corporate governance, leverage and company size affect the financial performance of BUMN companies listed on the IDX for the 2015-2019 period, on the other hand, corporate social responsibility does not affect the financial performance of BUMN companies listed on the IDX for the 2015-2019 period. had no effect on the financial performance of BUMN companies listed on the IDX for the 2015-2019 period.

scholarly journals Variation of Mechanical Characteristics of Polyurethane Foam: Effect of Test Method

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2672 ◽  
Author(s):  
Ki-Beom Park ◽  
Hee-Tae Kim ◽  
Nam-Yong Her ◽  
Jae-Myung Lee
Keyword(s):  
Polyurethane Foam ◽  
Evaluation Method ◽  
Mechanical Performance ◽  
Cell Structure ◽  
Extreme Environments ◽  
Evaluation Criteria ◽  
Test Method ◽  
Material Behavior ◽  
Insulation Material ◽  
Binding Effect

Polyurethane foam (PUF), a representative insulation material, not only prevents heat conduction but can also support a load. Particular interest in rigid PUF proliferated over the past several years in fields where extreme environments are applied. A closed-cell structure which forms the interior of rigid PUF serves to maximize the utilization of these polymeric foams. Rigid PUF is more sensitive to external conditions such as temperature or restraint than other structural materials such as steel. Depending on the market trends in which utilization of a cryogenic environment is expanding, the tendency of material behavior resulting from the binding effect also needs to be investigated. However, most conventional compression test method standards applicable to rigid PUF do not adequately reflect the restraints. Therefore, this study proposes a method for evaluating the mechanical performance of materials in a more reliable manner than that of conventional tests. Experimental observation and analysis validated this compression evaluation method in which constraints are considered. Consequently, the compressive strength of rigid PUF compared to the results of the conventional test showed a difference of up to 0.47 MPa (approximately 23%) at cryogenic temperatures. This result suggests that there are important factors to consider when assessing performance from a material perspective in an environment where rigid PUF insulation is utilized. It is believed that the test methods newly proposed in this study will provide an experimental framework that can be applied to the evaluation criteria of material properties and reflected in structural design.

The Simulation of Temperature Field of 12Cr2Mo1R Ultra Thick Plate for Pressure Vessels during Heat Treatment by 3D-FEM

2014 ◽  
Vol 556-562 ◽  
pp. 472-475
Author(s):  
Yi Zhang ◽  
Guang Xu ◽  
Yue Yu ◽  
Hai Lin Yang ◽  
Ming Xing Zhou
Keyword(s):  
Heat Treatment ◽  
Temperature Field ◽  
Thick Plate ◽  
Pressure Vessels ◽  
Thickness Direction ◽  
Cooling Process ◽  
3D Fem ◽  
Treatment Technology ◽  
Quenching Temperature ◽  
Simulation Results

With ABAQUS software, a finite element model is built to simulate the temperature field of 150mm ultra thick plate for 12Cr2Mo1R pressure vessels during heat treatment. The simulation results show that the plate’s temperature between the surface and the core is difference during cooling process. Temperature difference is gradually increased with cooling process, then the temperature distribution of plate in the thickness direction becomes uniform. When quenching temperature is 910 °C and cooling medium is water, the microstructure at plate’s quarter in the thickness direction is bainite. Simulation results provide theoretical reference for determining heat treatment technology in industrial production of ultra thick plate.

scholarly journals The Influence of Post-Heat-Treatments on the Tensile Strength and Surface Hardness of Selective Laser Melted AlSi10Mg

2017 ◽  
Vol 370 ◽  
pp. 171-176 ◽  
Author(s):  
Leonhard Hitzler ◽  
Amandine Charles ◽  
Andreas Öchsner
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Precipitation Hardening ◽  
Elevated Temperatures ◽  
Surface Hardness ◽  
Heat Treatments ◽  
Age Hardening ◽  
Material Strength ◽  
Post Heat Treatment ◽  
Treatment Procedure

Recent investigations revealed major fluctuations in the material properties of selective laser melted AlSi10Mg, which corresponded with the varying precipitation-hardening state of the microstructure, caused by the differing dwell times at elevated temperatures. It was indicated that a subsequent heat treatment balances the age-hardening and results in a homogenized material strength. In order to further investigate this statement selective laser melted AlSi10Mg samples were subject to multiple post-heat-treatments. Subsequently, the surface hardness and tensile strength was determined and compared with the as-built results. The post-heat-treatment led to an arbitrary occurrence of rupture, indicating a successful homogenization, coupled with a remarkable improvement in ductility, but to the costs of a lowered tensile strength, which was highly dependent on the chosen heat-treatment procedure.

scholarly journals ANALISIS PERSEPSI KONSUMEN TERHADAP KEPUTUSAN MEMBELI ULANG PRODUK KUOTA IM3 OOREDOO DI KOTA BANJARMASIN

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Jamaluddin Jamaluddin
Keyword(s):  
Service Quality ◽  
Sampling Method ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Statistical Test ◽  
Test Method ◽  
Consumer Perception ◽  
Independent Variables ◽  
Scale Method ◽  
The City

The study aims to determine the effect of consumer perception factors that can influence the decision to repurchase IM3 Ooredoo products to consumers in the city of Banjarmasin. The factors of consumer perception examined include Price, Service Quality, Location, Personal and Stimulus. The population of the study is all Banjarmasin city residents who use the IM3 Ooredoo Quota. Samples were taken with a non-probability sampling method with a sampling quota of 125 samples. By using a questionnaire with a Likert scale method. The statistical test method uses Multiple Linear Regression Analysis, with the hypothesis testing of the t statistical test and the F statistical test. The results of the analysis based on the use of all independent variables indicate that consumers' perceptions namely Price, Service Quality, Location, Personal and Stimulus together are able to influence Buying Decisions Repeat IM3 Ooredoo Quota Products in Banjarmasin City. While partially only stimulus variables are not able to show a significant relationship with the variable Repurchase Decision of IM3 Ooredoo Products in Banjarmasin City.Keywords: Price, Service Quality, Location, Personal, Stimulus, Repurchase Decision

scholarly journals PENGARUH METODE BERMAIN PERAN TERHADAP KEMAMPUAN BERBICARA ANAK KELOMPOK A DI TKK THOMAS AQUINO TUKA DALUNG

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Yohana Jesy Priyantini . ◽  
Drs. I Gusti Agung Oka Negara,S.Pd. M.Ke . ◽  
Dr. I G. A. Agung Sri Asri, M.Pd. .
Keyword(s):  
Experimental Design ◽  
Sampling Method ◽  
Alternative Hypothesis ◽  
Role Play ◽  
T Test ◽  
Contextual Learning ◽  
Test Method ◽  
Learning Program ◽  
Significant Difference ◽  
Post Test

sebelum dan sesudah dibelajarkan menggunakan metode bermain peran pada anak kelompok A Tkk Thomas Aquino Tuka Tahun Ajaran 2018/2019. Jenis penelitian ini adalah penelitian Pre-Experimental Design dengan menggunakan desain penelitian One Group Pretest-Posttest Design. Populasi dalam penelitian ini adalah seluruh anak A3 Di Tkk Thomas Aquino Tuka Dalung, Sampel dalam penelitian ini adalah 27 anak yang terdiri dari 18 anak perempuan dan 9 anak laki-laki. Sampel diambil dengan menggunakan tehnik sampling Jenuh serta data kemampuan berbicara anak diperoleh dengan menggunakan metode non tes, selanjutnya dianalisis menggunakan rumus uji–t dependent t test. Berdasarkan hasil analisis yang dilakukan dengan menggunakan uji-t di peroleh thitung = 14,13 > ttabel= 2,056 dengan taraf signifikan 5% dan dk = 26, sehingga H0 ditolak dan Ha diterima, ini berarti terdapat perbedaan yang signifikan terhadap kemampuan berbicara pada anak kelompok A melalui kegiatan bermain peran di Tkk Thomas Aquino Tuka dalung Tahun ajaran 2018/2019. Adapun data kemampuan Berbicara anak menunjukkan nilai rata-rata pre-test sebesar 50,13, sedangkan nilai rata-rata post-test sebesar 79,76. Maka dapat disimpulkan bahwa, Metode bermain peran berpengaruh terhadap kemampuan berbicara anak kelompok A Tkk Thomas Aquino Tuka Dalung Tahun Ajaran 2018/2019. Berdasarkan hasil tersebut dapat disarankan kepada guru untuk lebih mengembangkan inovasi dalam menerapkan pembelajaran kontekstual melalui kegiatan bermain peran.Kata Kunci : Kemampuan Berbicara, Metode bermain peran, Pre-Experimental Design This study aims to acquaint the influence of speaking ability towards child pre-test and post-test of applying the Role-play method to the group A3 of Thomas Aquino Kindergarten, Tuka, batch 2018/2019. This study is a study Pre-Experimental Design with the research method of One Group Pre-test and Post-test Design. The population of this study were all of the students in group A3 of Thomas Aquino Kindergarten, Tuka. The sample of this study were 27 students who consist of 18 females and 9 males students. The sample was conducted by the Saturation Sampling method and the data of the speaking ability of a child was obtained by the non-test method, then analysed by the Paired-t dependent t-test. Based on the result of analysis which organised by the Paired-t method, has obtained t-count = 14,13 is greater than (t-table) = 2,056 with significant level 5% and (dk=26), the Null Hypothesis (Ho) is rejected and the Alternative Hypothesis (Ha) is accepted. It means that there is a significant difference of speaking ability towards students in group A3 of Thomas Aquino Kindergarten, Tuka, batch 2018/2019 by Role-play method. However, the data of speaking ability towards child shows the average of the pre-test is 50,13, meanwhile the average post-test is 79,76. It can be concluded that the Role-play method affects on speaking ability towards students group A3 of Thomas Aquino Kindergarten, Tuka, batch 2018/2019. Regarding that study, it can be suggested to the teachers to develop more innovations in applying for the contextual learning program by the Role-play method.keyword : Speaking Ability, Role-play Method, Pre-experimental design, One Group Pretest-Posttest Design

scholarly journals PENGARUH KECUKUPAN MODAL, RISIKO DAN EFISIENSI TERHADAP KINERJA KEUANGAN BANK SEBELUM DAN MASA PANDEMI COVID-19

2021 ◽  
pp. 1469
Author(s):  
Rosmita Rasyid ◽  
Herni Kurniawati
Keyword(s):  
Regression Analysis ◽  
Multiple Regression ◽  
Sampling Method ◽  
Stock Exchange ◽  
Test Method ◽  
Capital Adequacy ◽  
Average Difference ◽  
Negative Effect ◽  
The Impact ◽  
Positive Effect

The purpose of this study is to examine the impact of covid 19 on financial performance and the factors that are thought to influence it, namely capital adequacy, risk and efficiency. The study was conducted on banking companies listed on the Indonesia Stock Exchange (IDX) in the 2019 and 2020 periods. , which results in a total of 21 banking companies as a sample. The test method used is to test the average difference and multiple regression analysis. The results show that the average ROA, CAR, NPL, LDR and BOPO before covid and during covid are significantly different. Multiple regression results show that LDR has a positive effect on ROA and BOPO has a negative effect on ROA while CAR and NPL have no effect on ROA.Tujuan penelitian ini adalah menguji dampak covid 19 atas kinerja keuangan serta faktor yang diduga mempengaruhinya yakni kecukupan modal, risiko dan efisiensi.Penelitian dilakukan pada perusahaan perbankan yang terdafrat di Bursa Efek Indonesia (BEI) pada periode 2019 dan 2020. Penentuan sampel berdasarkan purposive sampling method, yang menghasilkan jumlah  21 perusahaan perbankan sebagai sampel. Metode pengujian yang dipakai adalah dengan melakukan pengujian beda rata-rata dan analisis regresi berganda. Diperoleh hasil bahwa rata-rata ROA, CAR, NPL, LDR dan BOPO sebelum covid dengan selama covid adalah berbeda signikan, Hasil regresi berganda memperlihatkan bahwa LDR berpengaruh positif atas ROA dan BOPO berpengaruh negatif atas ROA sedangkan CAR, dan NPL tidak berpengaruh atas ROA.

Sign in / Sign up

Export Citation Format

Share Document